Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 13 of 13 for “"Grubbs' Catalyst"”.
-
Development of Micro and Nanostructured Materials for Interfacial Self -Healing
… of healing agent filled microcapsules and catalyst to the reinforcement-matrix interface. Microbond specimens, consisting of a single self-healing functionalized fiber embedded in a microdroplet of epoxy, are used to test virgin and healed fiber-matrix interfacial shear strength. When …
-
Engineering approaches to control polymer architecture
… metathesis polymerization with third generation Grubbs catalyst. This chapter provides the mechanistic origins of the unique zero order kinetics of the third generation Grubbs catalyst, and details the implementation of this for polymer synthesis. Chapter 4 will cover the design of polymer …
-
Novel encapsulation technologies for small size-scale self-healing applications
… reaction between dicyclopentadiene and Grubb’s catalyst is especially important to self-healing applications and provides a model system that uses both encapsulated liquid and solid healing agents. DCPD is encapsulated in polyureaformaldehyde (PUF) capsules while catalyst is protected in wax …
-
Autonomic healing of low-velocity impact damage in woven fiber-reinforced composites
… and wax-encapsulated first generation Grubbs' catalyst microspheres, were premixed into the liquid epoxy, and panels are fabricated using a hand layup technique and compression molding. Low-velocity impact damage was introduced to these panels by drop-weight impact testing. To visually …
-
Polymer Chemistry for Improved Self -Healing Composite Materials
… polymerization of endo-dicyclopentadiene using Grubbs' catalyst. The work herein describes improvements made to this original material. An improved technology is described which protects and delivers the catalyst within wax microspheres. This technique leads to greatly reduced required loadings …
-
Self-healing of delamination damage in glass/epoxy composites using catalyst functionalized fibers
… are functionalized with second generation Grubbs’ catalyst using an evaporative crystallization technique for catalyst deposition. Preforms are then used in the manufacture of laminated 2D woven composites. Healing of interlaminar fracture damage is evaluated in these composites using …
-
Fullerene hydrides and studies toward the syntheses of fulvalenes
… by a metathesis reaction using first generation Grubbs catalyst. The two precursors are attractive candidates for the parent compounds by using solid fluoride as the dehalosilylation inducing reagent in the final step.
-
Development of novel polymeric nanoparticles with tailored architectures and functionalities/
… of the highly efficient third-generation Grubbs catalyst to polymerize a polyethylene glycol (PEG) macromonomer (MM) and a bisnorbornene nitrobenzyloxycarbonyl (NBOC) photocleavable cross-linker to cross-link the brush-arms, which led to low-dispersity (Đ </=1.23) core-degradable BASPs. …
-
Development and exploration of Schiff base ruthenium carbene catalysts for olefin metathesis
… is presented on the history of metathesis catalysts, the current ideas in organometallic thinking and the theoretical accounts on Ru-metathesis catalysts. The second part deals with the synthesis and activity of Schiff base substituted second generation Grubbs catalysts, bimetallic Schiff …
-
Solvent-based self-healing polymeric materials
… dicyclopentadiene (DCPD) and wax-protected Grubbs’ catalyst. However the limitations of this system, including catalyst availability, cost, environmental toxicity, stability, and materials processing, motivated the search for a simpler approach to self-healing. Many chemical reactions …
-
Self-sealing of thermal fatigue and mechanical damage in fiber-reinforced composite materials
… (DCPD) monomer and wax protected Grubbs' catalyst healing components. A controlled amount of microcracking was introduced through cyclic indentation of opposing surfaces of the composite. The resulting damage zone was proportional to the indentation load. Healing was assessed …
-
Self-healing of high temperature cured epoxy and composites
… capsule-based self-healing systems, including catalyst stability and availability, cost, environmental toxicity, and difficulties in materials processing, have limited applications in low-temperature cured polymer matrices. Initially, self-healing epoxy adhesives were developed using a proven …
-
Control of micro- and nanostructure: I. polymer gas chromatography microcolumns and II. applications of ultrasound
… including analytical materials, composites, and catalysts. The first part of this thesis describes the development of a new method to produce gas chromatography (GC) microcolumns with a polymer substrate. The second part of this thesis concerns the use of ultrasonic nebulization of solutions and …